LEASES LEASES (Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Leases [Abstract]
Operating lease assets	$ 497	$ 500	$ 0
Finance lease assets	39
Total lease assets	536
Current operating lease liabilities	145		0
Current finance lease liabilities	4
Noncurrent operating lease liabilities	393		$ 0
Noncurrent finance lease liabilities	31
Total lease liabilities	573
Amortization of leased assets	$ 25